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From "ASF GitHub Bot (Jira)" <j...@apache.org>
Subject [jira] [Work logged] (HIVE-22821) Add necessary endpoints for proactive cache eviction
Date Wed, 18 Mar 2020 03:37:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-22821?focusedWorklogId=405190&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-405190
]

ASF GitHub Bot logged work on HIVE-22821:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 18/Mar/20 03:36
            Start Date: 18/Mar/20 03:36
    Worklog Time Spent: 10m 
      Work Description: b-slim commented on pull request #909: HIVE-22821
URL: https://github.com/apache/hive/pull/909#discussion_r394089629
 
 

 ##########
 File path: ql/src/java/org/apache/hadoop/hive/llap/ProactiveEviction.java
 ##########
 @@ -0,0 +1,311 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hadoop.hive.llap;
+
+import java.io.IOException;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+import javax.net.SocketFactory;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hive.common.io.CacheTag;
+import org.apache.hadoop.hive.conf.HiveConf;
+import org.apache.hadoop.hive.llap.daemon.rpc.LlapDaemonProtocolProtos;
+import org.apache.hadoop.hive.llap.impl.LlapManagementProtocolClientImpl;
+import org.apache.hadoop.hive.llap.registry.LlapServiceInstance;
+import org.apache.hadoop.hive.llap.registry.impl.LlapRegistryService;
+import org.apache.hadoop.io.retry.RetryPolicies;
+import org.apache.hadoop.io.retry.RetryPolicy;
+import org.apache.hadoop.net.NetUtils;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Through this class the caller (typically HS2) can request eviction of buffers from LLAP
cache by specifying a DB,
+ * table or partition name/(value). Request sending is implemented here.
+ */
+public final class ProactiveEviction {
+
+  private ProactiveEviction() {
+    // Not to be used;
+  }
+
+  /**
+   * Trigger LLAP cache eviction of buffers related to entities residing in request parameter.
+   * @param conf
+   * @param request
+   */
+  public static void evict(Configuration conf, Request request) {
+    if (!HiveConf.getBoolVar(conf, HiveConf.ConfVars.LLAP_IO_PROACTIVE_EVICTION_ENABLED))
{
+      return;
+    }
+
+    try {
+      LlapRegistryService llapRegistryService = LlapRegistryService.getClient(conf);
+      Collection<LlapServiceInstance> instances = llapRegistryService.getInstances().getAll();
+      if (instances.size() == 0) {
+        // Not in LLAP mode.
+        return;
+      }
+      ExecutorService executorService = Executors.newCachedThreadPool();
 
 Review comment:
   I hope you are convinced that Asynchronous stuff can be trick to get right and most of
the benefit can turn into debugging nightmare. Let me know if you have more questions
 
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Issue Time Tracking
-------------------

    Worklog Id:     (was: 405190)
    Time Spent: 4h  (was: 3h 50m)

> Add necessary endpoints for proactive cache eviction
> ----------------------------------------------------
>
>                 Key: HIVE-22821
>                 URL: https://issues.apache.org/jira/browse/HIVE-22821
>             Project: Hive
>          Issue Type: Sub-task
>          Components: llap
>            Reporter: Ádám Szita
>            Assignee: Ádám Szita
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: HIVE-22821.0.patch, HIVE-22821.1.patch, HIVE-22821.2.patch
>
>          Time Spent: 4h
>  Remaining Estimate: 0h
>
> Implement the parts required for iHS2 -> LLAP daemons communication:
>  * protobuf message schema and endpoints
>  * Hive configuration
>  * for use cases:
>  ** dropping db
>  ** dropping table
>  ** dropping partition from a table



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